ST7LITEU09 STMicroelectronics, ST7LITEU09 Datasheet - Page 50

• Manufacturer Part Number: ST7LITEU09
• Description: ST7ULTRALITE - 8-BIT MCU WITH 2K SINGLE VOLTAGE FLASH MEMORY, ADC, TIMERS
• Manufacturer: STMicroelectronics

Specifications of ST7LITEU09

• 2k Bytes Single Voltage Flash Program Memory With Read-out Protection, In-circuit And In-application Programming (icp And Iap). 10k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C
• 128 Bytes Data Eeprom. 300k Write/erase Cycles Guaranteed, Data Retention: 20 years at 55°C
• Clock Sources: internal trimmable 8MHz RC oscillator, internal low power, low frequency RC oscillator or external clock
• Five Power Saving Modes: Halt, Auto Wake Up from Halt, Active-Halt, Wait and Slow
• One 8-bit Lite Timer (lt) With Prescaler Including: watchdog, 1 realtime base and 1 input capture

Interrupts
Note:
50/139
AVD threshold selection register (AVDTHCR)
Reset value: 0000 0011 (03h)
Bits 7:5 = CK[2:0] internal RC Prescaler Selection
Bits 4:2 = Reserved, must be kept cleared.
Bits 1:0 = AVD[1:0] AVD Threshold Selection
Table 14.
Application notes
The LVDRF flag is not cleared when another Reset type occurs (external or watchdog), the
LVDRF flag remains set to keep trace of the original failure.
In this case, a watchdog reset can be detected by software while an external reset can not.
Table 15.
003Ah
003Eh
Address
(Hex.)
AVD1
CK2
Refer to
These bits are set and cleared by software and set by hardware after a reset. They
select the AVD threshold.
7
0
0
1
1
SICSR
Reset
value
AVDTHCR
Reset
value
Register
AVD threshold selection bits
System integrity register map and reset values
Section 7.2 on page
label
CK1
AVD0
0
1
0
1
CK2
7
0
0
CK0
CK1
6
1
0
32.
0
Read/write
CK0
5
1
0
0
Functionality
4
0
0
Medium
AVD off
High
Low
3
0
0
0
ST7LITEU05 ST7LITEU09
LVDRF
2
x
0
AVD1
AVDF
AVD1
1
0
1
AVD0
AVDIE
AVD2
0
0
0
1